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Argentina's Vice president Julio Cobos attends a legislative session in Buenos Aires, Wednesday, July 16, 2008. Cobos cast the tie-breaking vote early Thursday morning in a session that saw major defections from Argentinean President Cristina Fernandez's ruling coalition, representing a severe blow to her presidency. Fernandez is facing the most critical test to her 7-month-old tenure after the country's Senate rejected a package of export taxes she had pegged her reputation to.